(1-i)2-i=( )
A.2-2i
B.2+2i
C.3
D.-3i
(1-i)2-i=12-2×1×i+i2-i=1-2i+(-1)-i=-3i.
故选D
血管壁玻璃样变发生于哪类血管?其形态学表现如何?可造成什么影响?
(A) 条件(1)充分,但条件(2)不充分. (B) 条件(2)充分,但条件(1)不充分. (C) 条件(1)和(2)单独都不充分,但条件(1)和条件(2)联合起来充分. (D) 条件(1)充分,条件(2)也充分. (E) 条件(1)和条件(2)单独都不充分,条件(1)和条件(2)联合起来也不充分.
A garden is surrounded by a path that is 4 feet wide. What is the area of the path (1) The area of the path is [*] of the area of the garden. (2) The garden is circular with a 12-foot diameter.